Make Change – Focused

The light from a flashlight cannot travel a long distance. This is because the light is unfocused and diverges as the traveled distance increases. The flashlight beam traveling distance depends on the size of the flashlight and the batteries being used. Laser light, however, can travel a long distance: Any laser light can be beamed to the moon and back. They can travel such long distances as they are coherent and do not spread out while traveling. – physics expert